"Craig Brye" wrote in message
...
I've never used a top on my tanks, and have never lost a fish...

Really depends on the fish. SAEs are a bad idea with an open top tank, as
they like to jump (although you may get away with it for a while). And
species such as hatchet fish (carnegiella strigata) are definitely not possible
without a tight-fitting cover.

Cheers,

Michi.
--
Michi Henning Ph: +61 4 1118-2700
ZeroC, Inc. http://www.zeroc.com